Editing Movies in Windows Movie Maker
If you use Windows XP, go to http://www.microsoft.com/windowsxp/using/moviemaker/default.mspx
If you use Windows Vista, go to http://windowshelp.microsoft.com/Windows/en-US/Help/ec3fff68-e53c-4168-ae74-8557325e57e21033.mspx
I have found that Movie Maker serves pretty much all the basic needs to get you started using video. Most people don’t even know they have it on their computer, but it can be a great tool when you start including video in your presentations.